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Isoprene units are compounds with a formula CH₂=C(CH₃)-CH=CH₂ consisting of double bonds and five carbons.The simplest ones are the monoterpenes containing two isoprene units.

(a) In the neral compound, there are two isoprene units.

neral

(b) In the carvone compound, there are two isoprene units.

carvone

(c) In the lycopene compound, there are eight isoprene units.

lycopene

(d) In the $\mathrm{β}-carotene$compound, there are eight isoprene units.

$\mathrm{β}-\mathrm{carotene}$

(e) In the patchouli alcohol compound, there are three isoprene units.

patchouli alcohol

(f) In the periplanone B compound, there are three isoprene units.

periplanone B

(g) In a dextropimaric acid, there are four isoprene units.

dextropimaric acid

(h) In $\mathrm{β}-amyrin$, there are six isoprene units.

$\mathrm{β}-\mathrm{amyrin}$